Naperville, IL tornado June 2021

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"On June 20, 2021, an EF3 tornado went through Naperville, uprooting trees, injuring eight people, and damaging 231 homes" Wikipedia page.

The NWS has a web page clarifying the timing: "During the late evening into early overnight of Sunday, June 20, storms increased in intensity rapidly as they moved toward and into the Chicago metropolitan area, with damaging winds and three tornadoes." A useful central time marker would therefore be 06 UTC on 21 June, 2021. A surface pressure trough and cold cloud shield covered all of Illinois at that hour (first figure below).

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%make_image -capture legend -caption "Elongated SLP Low and IR cold cloud shield covers Illinois at 2021-06-21 06UTC"

Synoptic context

500 hPa heights, vorticity, omega

A broad, stationary trough from Montana to New York carried a series of sub-state-sized short waves (cyclonic vorticity anomalies,in red) across the upper Midwest on 20-21 June, 2021.

%make_movie -capture legend -caption "Broad trough with shortwaves" 

%make_movie -capture legend -caption "Streak of Positive 850mb vorticity appears to follow elongated low"

Surface pressure and 10m winds

At the surface, a Low closed and deepened suring the event (00-12 UTC)

%make_movie -capture legend -caption "Surface Low closed and deepened during the event (00-12 UTC)"

Omega 500 hPa

At the 500 hPA, strong negative omega forms over Canada then weakens as it moves to Minnesota before strengthening again as it approaches the event location (06/20 00 - 06/21 09 UTC). This all relates to the location of the low pressure as it depens.

%make_movie -capture legend -caption "Negative omega increases in magnitude north of event (06/20 15UTC- 06/21 06UTC)"

Local Information

Surface Observations

Surface winds strengthen and shift toward the location of the tornado at the time of the incident. Relative humidity substantially increases as well.

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